The Switch~Ball(TM) is constructed from premium grade steel with nickel-chrome plating for long life. Guaranteed for life against defects in manufacturing. An Independent laboratory extensively tested the shank and ball to insure quality and durability. Switch~Ball(TM) complies with National Standard SAE-J684 and V-5 Regulationsions for conversion ball sets. The exclusive 'J' Groove design ensures with the ball installed on the shank and engaged by a coupler, the hitching system is secure and has been proven safe through independent testing. Designed so the weight bearing capacity is resting on the shank, taking the stress away from the ball and freeing the coupler from friction and binding. This provides smoother and safer towing.